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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues $ 77,877 $ 87,507 $ 72,653
Transferred at Point in Time [Member]      
Revenues 68,175    
Transferred over Time [Member]      
Revenues 9,702    
DSP Products [Member]      
Revenues 59,466    
Connectivity Products [Member]      
Revenues 18,411    
License [Member]      
Revenues 40,446 42,899 31,874
License [Member] | Transferred at Point in Time [Member]      
Revenues 30,744    
License [Member] | Transferred over Time [Member]      
Revenues 9,702    
License [Member] | DSP Products [Member]      
Revenues 25,369    
License [Member] | Connectivity Products [Member]      
Revenues 15,077    
Royalty [Member]      
Revenues 37,431 44,608 40,779
Royalty [Member] | Transferred at Point in Time [Member]      
Revenues 37,431    
Royalty [Member] | Transferred over Time [Member]      
Revenues    
Royalty [Member] | DSP Products [Member]      
Revenues 34,097    
Royalty [Member] | Connectivity Products [Member]      
Revenues 3,334    
UNITED STATES      
Revenues 8,354 7,188 9,134
UNITED STATES | License [Member]      
Revenues 6,260    
UNITED STATES | Royalty [Member]      
Revenues 2,094    
Europe and Middle East [Member]      
Revenues 17,370 11,007 10,901
Europe and Middle East [Member] | License [Member]      
Revenues 3,672    
Europe and Middle East [Member] | Royalty [Member]      
Revenues 13,698    
Asia Pacific [Member]      
Revenues 52,153 $ 69,312 $ 52,618
Asia Pacific [Member] | License [Member]      
Revenues 30,514    
Asia Pacific [Member] | Royalty [Member]      
Revenues $ 21,639